Window locking device



WINDOW LOCKING DEVICE Fil ed April 26, 1946 FIG.- I.

lllllllllllllllllll FlG.2. FIGA.

20 /6 8 53 INVENTOR.

BAYARD F. SPARKS Al ATTORNEYS Patented Feb. 22, 1949 UNITED STATES PATENT OFFICE 2,462,434 WINDOW LOCKING DEVICE Bayard P. Sparks, St. James, N. Y. Application April 26, 1946, Serial No. 665,221 2 Claims. (01. 292 -155) This invention relates to improvements in window locks of the type that are adapted to be secured to the upper edge of the lower sash of a double hung window for locking the sashes by frictional pressure against the sash frame guides.

The prior frictional locks have not been easy to install, are unattractive in appearance and have a tendency to mar the window sashes. Usually these prior locks include a member which is secured by means of a plurality of screws to the upper rail of the window sash and has a threaded bore therethrough which receives a threaded bolt member having a button made of rubber or other material on the end which is adapted to be forced into engagement with the upper sash. These locks may include a latch or ratchet for locking the screw in its adjusted position.

In order to compensate for inaccurate positioning of the member secured to the lower sash, the screw member must be relatively long and for that reason, it projects out beyond the window sash. The projecting portion is unattractive and it has a tendency to catch the curtains or drapes as the sash is raised or lowered. Moreover, the rubber button cannot be secured tightly to the end of the bolt and, therefore, it is easily detached and lost. When the unprotected end of the bolt is pressed against the sash frame, it punches a recess in the sash frame which mars its appearance.

An object of the present invention is to provide a more attractive Window lock which overcomes the disadvantages of the prior window locks noted above.

Another object of the invention is to provide a compact attractive window lock which is easily manipulated and which will not mar the surface of the window sash.

A further object of the invention is to provide a Window lock which is easily applied to the window sash and which may be detached without leaving unsightly marks on the window sash.

Other objects of the invention will become apparent from the following description of a typical form of device embodying the present invention.

In accordance with the present invention, I have provided a window lock which is readily secured to or detached from a window sash. The lock may be detachably mounted on a dovetail element which is secured to the window frame.

More particularly, the window lock embodying the present invention includes a casing member which is provided with a slidable plunger having a large surface for engagement with the upper window sash and which is projected and retracted by means of an axially fixed bolt or other equivalent element. This arrangement makes possible extended movement of the plunger without rendering the locking device excessively long. The overall dimensions or length of my improved window lock are such that the lock does not proje'ct outwardly beyond the inner edge of the lower sash frame and, therefore, it does not interfere with curtains, blinds, drapes, or the like which overhang the window lock mechanism.

For a better understanding of the present invention, reference may be had to the accompanying drawings in which:

Figure 1 is a top plan view of a typical form of window lock embodying the present invention illustrated as applied to the upper edge of a double hung window, parts of the window sash and sash frame guides being shown in section;

Figure 2 is a view in section taken on line 2-2 of Figure 1;

Figure 3 is a view in section taken on line 3-3 of Figure 1; and

Figure 4 is a view in section taken on line 4-4 of Figure 2.

The form of the invention chosen for purposes of illustration includes a hollow casing l0 provided with a rectangular base i I that is adapted to be seated against the lower sash SI. The casing also has a semi-cylindrical end flange l2 which merges into a semi-cylindricalportion l3 that terminates in a semi-cylindrical :portion M of reduced diameter at'the right hand end of the casing.

The base portion ll of the casing [0, as shown in Figure 4, is provided with a generally V-shaped groove l5 having inwardly converging side walls It and I1 which engage the lateral edges of a wedge-shaped attaching member I8 that dovetails into the groove I5. The wedge-shaped member is is provided with a, plurality of screw holes i9 and has a centrally disposed longitudinally extending recess 2|] for receiving the heads of the screws.

The wedge-shaped member l8 may be positioned on the upper edge of the lower sash frame SI by means of a suitable templet and fixed thereto by means of screws with its narrow end toward the sash S2. The casing 10 with other contained locking elements then may be slipped over the member l8, when the upper sash S2 is lowered below the upper edge of the lower sash frame SI.

The locking elements of the device, as best shown in Figures 2 and 3, include a plunger member 2! having an enlarged flat disk-like head 22 thereon. The plunger member 2|, as shown in Figure 2, has a rounded upper surface 23, flat sides 24 and 25, and a fiat bottom 26 which are complementary to the shape of a recess 2'! in the casing If! so that the plunger can slide, but not rotate, in the recess 21. It will be understood, of course, that the shape of the plunger 2| and the recess 21 may be varied considerably so long as the plunger 2| does not rotate relatively to the casing Ill. J

The plunger 2| is provided with an internal recess 28 which is provided with threads 29 for engaging an enlarged threaded portion 30 on a shaft 3| that is rotatably, but not slidably, mounted in the casing Hi. The shaft 3 I is rotatably mounted in a bearing portion 32 near the right hand end of the portion l3 of the casing as viewed in Figure 3. The inner end of the threaded portion 30 engages a shoulder 33 at the adjacent end of the bearing 32 for preventing axial movement of the shaft 31 to the right.

Movement of the shaft 3| and the screw member 30 to the left is prevented'by means of a knob 34 which is nonrotatably mounted on the squared or noncircular end 35 of the shaft 31. The knob 34 has a shoulder 36 thereon which bears against the right hand end of the reduced portion IA of the casing [I] and has a sleeve 37 of reduced diameter which is rotatably received in .a circular recess 38 coaxial with and of larger diameter than the -bearing 32. When the knob 34 is pressed onto the end of the shaft 3|, the screw 36 is anchored against endwise movement, and, as aresult, when the knob 34 is rotated, the plunger 2i is advanced or retracted, depending upon the direction of rotation of the .knob 3 Th pitch of the screw threads on the plunger and the threaded member 30 may be varied but preferably a relatively coarse screw thread is provided in order to advance and retract the plunger 21 with a relatively small number of revolutions of the knob.

The above described casing, plunger, knob and t the like may be formed of castings which require a minimum of machining so that the device is relatively inexpensive and easy to manufacture. Also, the overall length of the device may be, as shown in Figure 1, well within the transverse dimensions of the window sash SI so that the device is inconspicuous .and will notinterfere with the movement of the sash. Moreover, if it is desired to remove the lock, the upper sash ,Sl may be lowered and the locking mechanism removed by pushing it forward over the upper edge of the lowered 'upper sash. When removed, only the thin Wedge-shaped member I 8 is left in position and this element, because of its size, is relatively unnoticeable and does not mar the appearance of the sash.

rnay be varied if desired. Therefore, the form of the invention described herein should be considered as illustrative of the invention and not as limiting the scope of the following claims.

I claim:

1. A locking device for window sashes, comprising a tubular casing having a noncircular recess therein, a smaller diameter bearing portion, and a circular bore larger in diameter than said bearing portion, said recess, bearing portion and bore being in alignment and extending the length 7 of said casing, an abutment shoulder between said recess and said bearing portion, a plunger member slidably and nonrotatably mounted in said recess, and having an internally threaded recess coaxial with and of larger diameter than said bearing portion, a shaft rotatably mounted in said bearing portion having an enlarged threaded end engaging said threaded recess and bearing against said shoulder to prevent axial movement of said shaft in one direction, and a knob fixed to said shaft having a sleeve portion disposed in said bore and a shoulder engaging said casing to prevent axial movement of said shaft in the other direction.

2. A locking device for window sashes comprising .a tubular casing having a recess therein and a smaller diameter bearing. portion, said recess and bearing portion being in alignment, an abut- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 'Number Name Date 925,644 Luden n June 22, 1909 1,492,017 Russell Jan. 3, 1922 1,857,050 Jones May 3, 1932 

